Chuck



W. F. HUCK May 30; 1933.

Filed March 21. 1931 INVENTOR- g M May 30, 1933. WFQUCK 1,912,201

CHUCK Filed March 21. 1931' 2 Sheets-Sheet 2 Patented May 30, 1933 UNITED STATES PATENT OFFICE wn-mnr 1. HUGE, or arcmroma ronxj assrcnoafro a. nor. a 00., mm

or new YORK, n.1, a coarona'rron or new You CHUCK Application fled larch 81, 1981; Serial I0. $241,831.

The invention relates to chucks that are used for holding a cutting or boring-tool securely in a suitable support. The device may be employed in connection with various tool machine has a spindle that rotates at hig s d, and router bits having cylindrical s anks are held in a chuck that is secured to or forms art of the spindle. It is necessary that the it be securely held to prevent its rotation relative to the spindle, and also that. it be held in accurate alignment with the spindle.

The object of theinvention is to provide a chuck adapted to grip the shank of a tool in a plurality of points peripherally and longitudinally of its surface.

Another object of the invention is to provide a chuck that is adapted to hold a tool in accurate axial alignment with a support.

It is also an object of the invention to pro vide a chuck of generally improved construc-v tion, whereby the device will be simple, durable and inexpensive in construction, as well as convenient, practical, serviceable and eflicient in its use.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention residesin the combinatlon and arrangement of arts, and in the details of construction hereinafter described and claimed it being understood that various changes'in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departfrom the spirit of the invention.

. e embodiment of the invention is illustrated in the accompanying drawings, wherein: s

Figure 1 shows a-sectional'view of a router head incorporating the chuck that is the subject of the invention;

Figure 2 is anenlarged view of the chuck e ,;;Figur e 8 is a view similar:to Figure 2,

partly broken away to show portions of the jaw member in section: I Figure 4 is a fragmental side view of the jaw member as seen in the direction'ofarrow 4 of Figure 2; and

Fi re 5 is a bottom view of the jaw mem ras seen in the direction of arrow 5 of Figure 2.

Referring. to Figure 1, the numeral 11 indicates the body portion of the head of a routing machine, such as is used in the preparation of electrotype and stereotype printing plates to cut away excess metal from the non-printing portions of the plates. In this work. router bits of various sizes are a used, depending onthe character of the late that is being operated upon. These 1138 are commonly made with cylindrical and are held in a s indle at is rotated on a vertical axis, in a ead th t may be moved by the operator in order to guide the tool in the desired path.

Ball bearings are indicated generally at 12, 13 and 14, and have outer races 12', 13' and 14', fitted to the body member 11. A spindle 15 is formed with a flange 16 and a seat 17 fitted tothe inner race 14" of the bearing 14. A smaller diameter seat. 17f is similarly fitted to the innerraces 12" and 13" of the bearings 12 and 13, and a spacing collar 18 is placed on the spindle between the races 13' and 1 A pulley .19'have a lie e 21, which abuts shanks of approximately :Eiform diameter against the-inner race 12 and anut 22 is 95 threaded on the spindle 15, and secures the e body member 11 is provided with a shoulder 23, fitted to the outer race 14' of:

the bearing 14, and the cap 24 is secured to the body memberll'and also engages the outer race 14', holding it in position. The spindle is thus rotatably held in the jaws and may be driven by a belt running on the pulley 19. v t The spindle as herein shown is made hollow and constitutes an. outer member of the chuck. -A red 25 is threaded at its upper end to engage a thumb 1mg- 26 'and has a cap 27 secured to its upper extremity. The lower end of the rod is preferably secured to the inner chuck or jaw member 28. As herein shown, it is held by a screw thread,

6 but any suitable means may be employed,

. that of the body of the aw member, except at. their lower extremities, where the diameter is enlarged and tapered faces are formed as indicated at 32 and 32. These tapered faces engage with the wall of the spindle 15.

In operation, the shank of the bit is placed within the coils of the jaw member and the nut 26 is screwed down on the rod 25. The

nut 26 engages the wall of the spindle 15 at its upper end and the jaw member 28 is thus raised until the inclined faces 32 and 32 engage with the wall of the, spindle 15 at its lower end. Continued turning of the nut 26.'results in first closing the extremities of the .coils of the jaw member so they are tightenedon the shank, and still further tightening of the nut results in elongating the jaw member 28 and contracting the coils so that the shank is held rigidly and accurately centered in the spindle.

What I claim is: 1. In a means for holding a tool having a shank, a helically formed coil adapted to receive the shank, and means other than the tool to elongate and thereby constrict the coil to grip the shank.

2. In a chuck adapted to hold a tool having a shank, a helically formed chuck member adapted to receive the shank, and means secured to said member and bodily moving same as a unit longitudinally within an outer member connected thereto to elongate and thereb contract the said chuck member to grip t e shank.

3. In a chuck for holding a tool having a cylindrical shank, an inner chuck member having helical means integral therewith and formed to receive the shank, an outer chuck member adapted to engage with one end of the helical means, and other means to elongate and thereby contract the helical means.

4. In a chuck for holding a tool havin a I cylindrical shank, an inner chuck mem er having helical means integral therewith and formed to receive the shank, an outer chuck member adapted to en age with one end of the inner member, an means engaging the other end of the inner member whereby the helical means may be elongated and thereby contracted diametrically to grip the shank.

5. In a'chuck for operatively holdin and centering a rotary tool having a cylin rical shank, a jaw member having a helical coil formed to surround the shank, an outer member within which the jaw member is movable axially, a face adjacent one end of the jaw member, adapted to engage with the outer member, and means acting on the other end of the jaw member to elongate it and contract the .coil diametrically.

6. In a chuck for operatively holdin and centering a rotary tool having a cylin rical shank, a-jaw member having a helical coil formed to surround the shank, an outer member within which the j aw member is movable axially, an inclined surface on oneend of the jaw member adapted to engage with one end of the outer member, and means connected to the other end of the jaw member and cooperating with the other end of theouter member whereby the coil may be elongated to contract it diametrically.

7. In a device for holding a rotatable cutting tool having a shank, a spindle, a jaw member movable axiall in the spindle and having a helical coil a apted to receive the shank, an inclined surface at one extremity of the coil adapted to engage with one end of the spindle, a rod connected to the jaw member, and a nut threaded on the rod and engaging the spindle whereby the coil may be elongated and simultaneously contracted diametrically to rip the tool.

8. In a chuck or holding a tool having a cylindrical shank, a jaw member having a plurality of helical coils formed to encircle the shank, and means to elongate the coils and to contract them diametricallyto grip the shank.

9. In a chuck .for operatively holding a tool having a cylindrical shank, an inner chuck member having a plurality of helical coils formed to encircle the shank, an outer chuck member adapted to engage with one end of each coil, and means to elongate and to contract the coils diametrically. I

' 10. In a chuck foroperatively holding a tool havin a cylindrical shan an inner chuck mem er having a plurality of helically formed coils adapted to receive the shank,

I with tapered portions-f0 and means acting on the other end of the jaw member to elongate the coils and to contract them diametrically.

12. In a chuck for operatively holding a tool having a cylindrical shank, a 'aw member having a plurality of helical coils formed to surround the shank, an outer member within which the jaw member is movable axially, an inclined surface on one end of each coil adapted to engage with one end of the outer member, and means coacting with the jaw member and co-operatin with the other end of the outer member w ereby the said jaw member may be elongated and the coils contracted diametrically.

13. In a chuck for operativel holding a rotary tool havin a cylindrica shank, an inner chuck mem er having alurality of helically-formed coils individu ly adapted to frictionally engage the said shank, an outer chuck member engageable with one of the inner chuck, and means secured to the chuck for pulling on to the other end of the chuck member and thereby contracting the said coils diametrically into a closer frictional engagement with the shank.

14. In a chuck for operativel holdinga rotary tool havin a cylindrica shank, an inner chuck mem r having a gllurality of helically formed coils individua y-adapted to frictionally engage the said shank, an outer chuck member wedgilfily en geable rm on e coils, and means threadedl secured to the chuck for shifting same axially and thereb contracting the said coils when the sai coils are moved inwardly relatively to the outer chuck while said tapered portions are wedgingly engaged with the outer chuck mem r, w

15. In a chuck for operatively holding a rotary tool having a cylindrical shank,.a jaw member having a helical coil formed to encircle and frictionally engage the shank at different ortions of t e periphery thereof a cylindrical member receiving and helical coil and contacting directl with said 'aw with the hehcab member, and means enga coil and coactable with the cylindrical member for elongatingthe said coil to contract same diametrically into frictionally engagement with the periphery of the shank.

In testimony whereof, I afiix my attire. 

